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Intermittent "No Ranging Response received - T3 time-out"

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Regular Visitor

Intermittent "No Ranging Response received - T3 time-out"

I've been dealing with this issue since I moved and got setup in my new house. It was an annoyance but one I could deal with, but its been causing issues with my work from home connection.  I will get t3 timeouts a few times a day, some only a few minutes apart but then have service without issues for hours. Sometimes the periods without interruption can last up to a week.

This is on a NETGEAR CM700 modem that was purchased new and had no issues at our previous address.  We had a service call out in August to inspect the lines and he couldnt find anything wrong. I'm thinking this might be an issue outside my home and further up the infrastructure chain in our neighborhood.

Log example below.

Mar 16 2020 01:19:21 Warning (5) MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Mar 16 2020 01:19:21 Warning (5) MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Mar 16 2020 08:44:02 Critical (3) No Ranging Response received - T3 time-out
Mar 16 2020 08:44:46 Critical (3) Ranging Request Retries exhausted
Mar 16 2020 08:44:46 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted
Mar 16 2020 08:44:49 Critical (3) No Ranging Response received - T3 time-out
Mar 16 2020 08:46:09 Warning (5) MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Mar 16 2020 08:49:38 Critical (3) No Ranging Response received - T3 time-out
Mar 16 2020 08:51:15 Warning (5) MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Mar 16 2020 09:00:29 Critical (3) No Ranging Response received - T3 time-out
Mar 16 2020 09:04:02 Critical (3) Ranging Request Retries exhausted
Mar 16 2020 09:04:02 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted
Mar 16 2020 09:04:06 Critical (3) No Ranging Response received - T3 time-out
Mar 16 2020 09:06:13 Warning (5) MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Mar 16 2020 09:56:53 Critical (3) No Ranging Response received - T3 time-out
Mar 16 2020 09:57:36 Critical (3) Ranging Request Retries exhausted
Mar 16 2020 09:57:36 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted
Mar 16 2020 09:57:37 Critical (3) No Ranging Response received - T3 time-out
Mar 16 2020 10:00:01 Warning (5) MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Mar 16 2020 10:35:38 Critical (3) No Ranging Response received - T3 time-out
Mar 16 2020 15:25:54 Critical (3) Ranging Request Retries exhausted
Mar 16 2020 15:25:54 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted
Mar 16 2020 15:25:54 Critical (3) No Ranging Response received - T3 time-out
Mar 16 2020 15:29:49 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out
Mar 16 2020 15:30:16 Critical (3) No Ranging Response received - T3 time-out
Mar 16 2020 15:30:35 Warning (5) MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Mar 16 2020 15:50:26 Critical (3) No Ranging Response received - T3 time-out
Mar 16 2020 17:38:04 Critical (3) Ranging Request Retries exhausted
Mar 16 2020 17:38:04 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted
Mar 16 2020 17:38:14 Critical (3) Ranging Request Retries exhausted
Mar 16 2020 17:38:14 Critical (3) Unicast Maintenance Ranging attempted - No response - Retries exhausted
Mar 16 2020 17:38:16 Critical (3) No Ranging Response received - T3 time-out
Mar 16 2020 17:42:14 Critical (3) Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out
Mar 16 2020 17:43:04 Warning (5) MIMO Event MIMO: Stored MIMO=-1 post cfg file MIMO=-1
Mar 16 2020 17:55:55 Critical (3) No Ranging Response received - T3 time-out
Mar 16 2020 17:56:39 Critical (3) Ranging Request Retries exhausted
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Expert

Re: Intermittent "No Ranging Response received - T3 time-out"

You need to also post the modem's signal status.


Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.





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Regular Visitor

Re: Intermittent "No Ranging Response received - T3 time-out"

Downstream Bonded Channels
Channel Lock Status Modulation Channel ID Frequency Power SNR Correctables UnCorrectables
1 Locked QAM 256 5 633000000 Hz 1.9 dBmV 40.3 dB 246 1334
2 Locked QAM 256 6 639000000 Hz 1.7 dBmV 40.3 dB 141 283
3 Locked QAM 256 7 645000000 Hz 1.7 dBmV 40.3 dB 145 258
4 Locked QAM 256 8 651000000 Hz 1.7 dBmV 40.3 dB 158 266
5 Locked QAM 256 9 657000000 Hz 1.5 dBmV 40.3 dB 411 997
6 Locked QAM 256 10 663000000 Hz 1.7 dBmV 38.9 dB 338 1122
7 Locked QAM 256 11 669000000 Hz 1.5 dBmV 40.3 dB 170 218
8 Locked QAM 256 12 675000000 Hz 1.7 dBmV 40.3 dB 171 242
9 Locked QAM 256 13 681000000 Hz 2.2 dBmV 40.9 dB 240 1357
10 Locked QAM 256 14 687000000 Hz 2.2 dBmV 38.9 dB 293 1132
11 Locked QAM 256 15 693000000 Hz 2.5 dBmV 40.3 dB 203 1152
12 Locked QAM 256 16 699000000 Hz 2.4 dBmV 40.3 dB 292 1317
13 Locked QAM 256 17 705000000 Hz 2.5 dBmV 40.3 dB 359 1224
14 Locked QAM 256 18 711000000 Hz 2.7 dBmV 40.3 dB 346 2367
15 Locked QAM 256 19 717000000 Hz 3.0 dBmV 38.9 dB 298 2152
16 Locked QAM 256 20 723000000 Hz 2.9 dBmV 40.3 dB 184 1150
17 Locked QAM 256 21 729000000 Hz 3.0 dBmV 38.9 dB 670 2038
18 Locked QAM 256 22 735000000 Hz 3.0 dBmV 38.9 dB 239 1332
19 Locked QAM 256 23 741000000 Hz 3.0 dBmV 40.3 dB 176 252
20 Locked QAM 256 24 747000000 Hz 3.2 dBmV 38.9 dB 430 3373
21 Locked QAM 256 25 753000000 Hz 2.7 dBmV 38.9 dB 220 1244
22 Locked QAM 256 26 759000000 Hz 2.7 dBmV 38.9 dB 217 1223
23 Locked QAM 256 27 765000000 Hz 2.2 dBmV 38.9 dB 381 2005
24 Locked QAM 256 28 771000000 Hz 2.2 dBmV 38.9 dB 346 2242
25 Locked QAM 256 29 777000000 Hz 2.2 dBmV 39.5 dB 81 814
26 Locked QAM 256 30 783000000 Hz 2.2 dBmV 39.2 dB 62 768
27 Locked QAM 256 31 789000000 Hz 2.0 dBmV 38.9 dB 90 823
28 Locked QAM 256 32 795000000 Hz 1.7 dBmV 38.9 dB 84 777
29 Locked QAM 256 34 801000000 Hz 1.7 dBmV 38.9 dB 231 1665
30 Locked QAM 256 35 807000000 Hz 1.7 dBmV 38.9 dB 105 1792
31 Locked QAM 256 36 813000000 Hz 1.5 dBmV 38.9 dB 80 842
32 Locked QAM 256 37 819000000 Hz 1.4 dBmV 38.9 dB 192 1662

Upstream Bonded Channels
Channel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power
1 Locked ATDMA 35 5120 Ksym/sec 23700000 Hz 44.0 dBmV
2 Locked ATDMA 34 5120 Ksym/sec 30100000 Hz 45.3 dBmV
3 Locked ATDMA 33 5120 Ksym/sec 36500000 Hz 44.8 dBmV
4 Not Locked N/A Unknown 0 Ksym/sec 0 Hz 0.0 dBmV
5 Not Locked N/A Unknown 0 Ksym/sec 0 Hz 0.0 dBmV
6 Not Locked N/A Unknown 0 Ksym/sec 0 Hz 0.0 dBmV
7 Not Locked N/A Unknown 0 Ksym/sec 0 Hz 0.0 dBmV
8 Not Locked N/A Unknown 0 Ksym/sec 0 Hz 0.0 dBmV

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Expert

Re: Intermittent "No Ranging Response received - T3 time-out"

The stats at that snapshot in time were fine. Is there a router / WiFi in the mix here ? If so, for a test, does a computer hardwired directly to the router device with an ethernet cable have the same problem ?



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Regular Visitor

Re: Intermittent "No Ranging Response received - T3 time-out"

I'll try to specifically grab a snapshot the next time its acting up.

Yes, I did earlier testing with the internet connection going straight from the modem to my desktop PC and we still saw the  T3 upstream issues periodically.

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Expert

Re: Intermittent "No Ranging Response received - T3 time-out"

I'm not referring to the T3's at this moment. Those can happen no matter what (even if nothing) is connected to the modem. I'm talking about if you are experiencing actual connection drops / lapses, not just the log entries ?



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Regular Visitor

Re: Intermittent "No Ranging Response received - T3 time-out"

Yes, I experience interruptions in connectivity on my devices as a result of this.

If I'm streaming doing voice chats in Discord I stop being able to send packets up, but I still receive downbound packets for a few more seconds. Then I lose all connectivty and the upstream light starts flashing on the modem. Powering off and on always resolves the issue. All devices on wi-fi and wired connections are affected. Sometimes it happens once and then is fine for hours. Sometimes, I have to reset the modem multiple times within a 10 minute period.

I specifically had my desktop PC wired directly to the modem, removing the wi-fi hubs from my setup temporarliy and had the same upstream connection loss occur.

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Expert

Re: Intermittent "No Ranging Response received - T3 time-out"

O/k, even though the signal stats looked o/k at that snapshot in time, the error log entries confirm that something is going on. Perhaps there is intermittent noise ingress into the line(s) somewhere.

 

There are other signal stat figures that can't be read by the modem. They are the "Upstream Rx Power" (Upstream Receive Power Level), the "Upstream SNR Ch." (Upstream Signal To Noise Ratio), and the "Upstream ICFR" (In Channel Frequency Response). These are as equally important in diagnosing connectivity issues as are the modem's stats.


I'm going to escalate your issue to the Comcast corporate employees that are available to these boards. They can check the CMTS (Cable Modem Termination System) for any real time degradation and / or error reports, see your node / cable plant and modem health, and see whether or not everything is in the green zone. They can also see a history plot for the modem and poll for those upstream receive signal stats.

You should get a reply here in your topic. Good luck !



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Official Employee

Re: Intermittent "No Ranging Response received - T3 time-out"

Hello DigitalDeckard. We appreciate you visiting and posting on the Xfinity Forums. I can assist with troubleshooting your Internet timeouts issue. In order to have a better insight, I will have to poll the CMTS for real-time and historical RF signal reports from your modem, and check your local Node/Plant for signal degradation / errors. Please send me a private message and include your full name so I can access your equipment.



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